Best Free Password Strength Checker
A live password strength meter with entropy, crack-time and a strong-password generator — free, all in your browser.
100% free
No signup
No watermark
Files processed in memory, never stored
✨
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How it works
- Type a password. Enter the password you want to test; use the Show toggle to check what you typed.
- Read the meter. Watch the strength bar, entropy and crack-time update live, with concrete suggestions below.
- Generate a stronger one. Open Advanced options to create a random strong password or score a passphrase. Everything stays in your browser.
About this tool
See exactly how strong a password is as you type it. This checker scores length and the mix of character types (lowercase, uppercase, digits and symbols), penalises common passwords and obvious sequences like 123456 or qwerty, and turns that into an entropy estimate, a coloured Very-weak-to-Very-strong meter and a rough time-to-crack. Crucially, your password never leaves the page — there is no network request, so it is safe to test the real thing. The Advanced options add a cryptographically-random password generator and a passphrase mode that rewards length over symbols.
What people use it for
- Check whether a password is strong enough before using it
- See how much length and symbols improve strength
- Generate a cryptographically-random strong password
- Test a passphrase without sending it anywhere
Frequently asked questions
No. The strength check runs entirely in JavaScript in your browser, with no network request, so the password you type is never uploaded, logged or stored anywhere — it is safe to test a real password.
It estimates entropy from the password length and the size of the character pool you use (lowercase, uppercase, digits, symbols), then penalises common passwords and obvious patterns like 123456, qwerty or repeated and sequential characters.
It is a rough guide assuming a fast offline attacker trying about ten billion guesses per second. It is an order-of-magnitude indicator, not a guarantee — real attack speed depends on how the password is hashed and stored.
A passphrase is several words strung together. Passphrase mode rewards overall length more and stops nagging you to add uppercase or symbols, since a long multi-word phrase can be very strong while staying memorable.
Yes. Open Advanced options and click Generate; it builds an 18-character password using your browser’s cryptographic random source, which you can copy with one click. It is never sent anywhere.
Completely free, no account, no limits — it is a client-side tool with nothing to meter and nothing to upload.
Yes. It runs in your browser, so Password Strength Checker works on phones and tablets as well as desktop — there is no app to install.
Usually just a few seconds for a typical file — Password Strength Checker starts working the moment you give it your input.
Casual use is unlimited, under a generous fair-use cap that keeps it fast for everyone.
All modern browsers — Chrome, Safari, Firefox and Edge. Password Strength Checker needs nothing installed beyond the browser you already use.